248 American Midland Naturalist Monograph No. 6 



plane, mostly entire; costa various, mostly short; cells narrowly rectangular- 

 oblong to linear-prosenchymatou5, smooth; alar cells forming a distinct group, 

 yellowish, incrassate to inflated, small, quadrate: seta long, drying twisted, 

 reddish to yellowish-red; capsule inclined to horizontal, sub-cylindric, arcuate, 

 annulate; peristome normally hypnoid; lid convex, acute to conic-obtuse; spores 

 small. 



About 30 species in both dry and wet habitats, mainly confined to the tem- 

 perate regions; about 20 species reported for North America; 4 species now 

 known in our region. 



Key to the Species 



A. Costa simple, thin, ending in about the middle of the leaf, or somewhat above the 



middle C 



A. Costa none or very short B 



B. Stem slender, creeping; leaves finely serrulate all around; alar cells small, quadrate 



1. C. hispidulum 



B. Stem usually erect or ascending; leaves entire; alar cells dilated, sub-rectangular 



4. C. stellatum 



C. Leaves strongly squarrose; alar cells scarcely enlarged 2. C. chrysophyllum 



C. Leaves spreading-erect; alar cells enlarged D 



D. Stem-leaves very slenderly acuminate from a broadly lanceolate blade 3. ..C folyganum 

 D. Stem-leaves abruptly acuminate from a cordate-ovate blade 5. C. radicalc 



1. Campylium hispidulum (Bridel) Mitten 



(Hypnum hispidulum Bridel; Chrysohypnum hispidulum Roth; Stereodon 

 hispidulus Mitten; Amblystegium hispidulum Kindberg) 



Plate XLV 



Slender, interlaced in bright green tufts more or less yellowish below; 

 stems creeping radiculose, abundantly but irregularly branching, the branchlets 

 slender and erect or ascending; leaves widely spreading to distinctly squarrose, 

 about 0.5-0.8 m.m long, triangular-cordate, abruptly acuminate, the slender 

 acumen about one-third as long as the main body of the leaf, the leaf slightly 

 concave, decurrent, sub-serrulate all around, excavate at the base; costa double 

 and very short, or none; median leaf-cells about 3-6:1, with .005-. 006 mm 

 wide, prosenchymatous, elongate-oblong with blunt ends, the alar numerous, 

 sub-rectangular to quadrate, granulose, up to twice as wide as the median cells: 

 seta pale castaneous to yellow, about 1.5-2 cm long, slender dextrorse; capsule 

 small, oblong, more or less incurved, yellowish-brown, wide-mouthed, the urn 

 about 1.2-1.4 mm long, when dry furrowed and narrowed below th? mouth; 

 annulus uni-seriate; lid convex-conic with an upturned apiculation; peristome 

 normally hypnoid, the segments slightly cleft and almost equalled in length 

 by the nodose to sub-appendiculate cilia; spores mature in summer, yellowish, 

 medium-walled, minutely papillose, about .011-. 014 mm. 



On the bases and roots of trees, on decaying wood, on humus, etc., always 

 near the ground in moist shaded places; in Europe, Asia, and, in North Amer- 

 ica from Canada to the southern part of the United States. 



Rather common in our region. Now known from .Allegheny, Cambria (Porter), Cen- 

 tre, Erie, Indiana (Porter), Fayette. McKean, Washington, and Westmoreland counties. 

 Specimen figured: Edge of pond at Scotia, Centre Co., Sept. 20, 1909. O.E.J. 



